GOULD, H. W. Note on a Paper of Sparre Andersen. Mathematica Scandinavica, Berkeley, CA, United States, v. 6, p. 226–230, 1958. DOI: 10.7146/math.scand.a-10547. Disponível em: https://journals.msp.org/mscand/article/view/2803. Acesso em: 25 jul. 2026.